Which product is not formed in the following | vedclass

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(D) The reaction is a mixed (cross) Aldol condensation between acetaldehyde $(CH_3CHO)$ and propanal $(CH_3CH_2CHO)$.Both aldehydes have $\alpha$-hydr

Vedclass · Accepted Answer

$CH_3-CH=C(CH_3)-CHO$

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(D) The reaction is a mixed (cross) Aldol condensation between acetaldehyde $(CH_3CHO)$ and propanal $(CH_3CH_2CHO)$.Both aldehydes have $\alpha$-hydrogens,so four possible aldol products can be formed:$1$. Self-aldol of $CH_3CHO$: $CH_3-CH=CH-CHO$ (But$-2-$enal)$2$. Self-aldol of $CH_3CH_2CHO$: $CH_3-CH_2-CH=C(CH_3)-CHO$ ($2$-methylpent$-2-$enal)$3$. Cross-aldol ($CH_3CHO$ as nucleophile): $CH_3-CH_2-CH=CH-CHO$ (Pent$-2-$enal)$4$. Cross-aldol ($CH_3CH_2CHO$ as nucleophile): $CH_3-CH=C(CH_3)-CHO$ ($2$-methylbut$-2-$enal)Option $D$ in the original image represents $CH_3-CH=CH-CH_2-CHO$,which is not an $\alpha,\beta$-unsaturated aldehyde and is not a product of this condensation reaction.

Which product is not formed in the following reaction $:-$ $CH_3CHO + CH_3-CH_2-CHO \xrightarrow[\text {(ii) } \Delta]{\text {(i) } NaOH}$

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